I am helping a friend start up a free forums with invisionfree. It seems that the page is too big for him (it is fine for me) and the right edge of the forums go out of the window. He should be able to see the rest of the page, I can, but he cannot.

http://img24.imageshack.us/img24/700/cutoff.png

Is there a way I can say, make the page collapsible? For example, when you maximize this page you are on right now, then slowly make the window smaller pulling the right side in, this reply box gets smaller. I want the forums to be able to do that.